[hle] make HBLoader work, add -hlaunch option (#3981)

hbloader is required to launch a bunch of shit (particularly hbmenu)

however due to some restrictive metadata validation, it doesn't get recognized as an NSP file

programs like hbmenu require hbloader (since it feeds them data like ConfigEntries and whatnot), launching hbmenu as-is standalone will result in a launchInit() error

adds an option to launch hbmenu via command line

Signed-off-by: lizzie <[email protected]>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3981
Reviewed-by: Maufeat <[email protected]>
Reviewed-by: crueter <[email protected]>

docs/user/CommandLine.md

@@ -10,6 +10,9 @@ There are two main applications, an SDL-based app (`eden-cli`) and a Qt based ap
 - `-u <number>`: Select the index of the user to load as.
 - `-input-profile <name>`: Specifies input profile name to use (for player #0 only).
 - `-qlaunch`: Launch QLaunch.
+- `-hlaunch`: Launch homebrew launcher `nx-hbloader`.
+    - Requires a copy of Atmosphere to be extracted onto `sdmc`.
+    - This is a shorthand for `<eden folder>/sdmc/atmosphere/hbl.nsp`.
 - `-setup`: Launch setup applet.
 
 ## eden-cli